cpufreq: Implement light weight ->target_index() routine

Currently, the prototype of cpufreq_drivers target routines is:

int target(struct cpufreq_policy *policy, unsigned int target_freq,
		unsigned int relation);

And most of the drivers call cpufreq_frequency_table_target() to get a valid
index of their frequency table which is closest to the target_freq. And they
don't use target_freq and relation after that.

So, it makes sense to just do this work in cpufreq core before calling
cpufreq_frequency_table_target() and simply pass index instead. But this can be
done only with drivers which expose their frequency table with cpufreq core. For
others we need to stick with the old prototype of target() until those drivers
are converted to expose frequency tables.

This patch implements the new light weight prototype for target_index() routine.
It looks like this:

int target_index(struct cpufreq_policy *policy, unsigned int index);

CPUFreq core will call cpufreq_frequency_table_target() before calling this
routine and pass index to it. Because CPUFreq core now requires to call routines
present in freq_table.c CONFIG_CPU_FREQ_TABLE must be enabled all the time.

This also marks target() interface as deprecated. So, that new drivers avoid
using it. And Documentation is updated accordingly.

It also converts existing .target() to newly defined light weight
.target_index() routine for many driver.

Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Russell King <linux@arm.linux.org.uk>
Acked-by: David S. Miller <davem@davemloft.net>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@rjwysocki.net>

1 files changed, 5 insertions, 12 deletions

diff --git a/drivers/cpufreq/arm_big_little.c b/drivers/cpufreq/arm_big_little.c
index 086f7c1..163e337 100644
--- a/drivers/cpufreq/arm_big_little.c
+++ b/drivers/cpufreq/arm_big_little.c
@@ -49,28 +49,21 @@ static unsigned int bL_cpufreq_get(unsigned int cpu)
 
 /* Set clock frequency */
 static int bL_cpufreq_set_target(struct cpufreq_policy *policy,
-		unsigned int target_freq, unsigned int relation)
+		unsigned int index)
 {
 	struct cpufreq_freqs freqs;
-	u32 cpu = policy->cpu, freq_tab_idx, cur_cluster;
+	u32 cpu = policy->cpu, cur_cluster;
 	int ret = 0;
 
 	cur_cluster = cpu_to_cluster(policy->cpu);
 
 	freqs.old = bL_cpufreq_get(policy->cpu);
-
-	/* Determine valid target frequency using freq_table */
-	cpufreq_frequency_table_target(policy, freq_table[cur_cluster],
-			target_freq, relation, &freq_tab_idx);
-	freqs.new = freq_table[cur_cluster][freq_tab_idx].frequency;
+	freqs.new = freq_table[cur_cluster][index].frequency;
 
 	pr_debug("%s: cpu: %d, cluster: %d, oldfreq: %d, target freq: %d, new freq: %d\n",
-			__func__, cpu, cur_cluster, freqs.old, target_freq,
+			__func__, cpu, cur_cluster, freqs.old, freqs.new,
 			freqs.new);
 
-	if (freqs.old == freqs.new)
-		return 0;
-
 	cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
 
 	ret = clk_set_rate(clk[cur_cluster], freqs.new * 1000);
@@ -200,7 +193,7 @@ static struct cpufreq_driver bL_cpufreq_driver = {
 	.flags			= CPUFREQ_STICKY |
 					CPUFREQ_HAVE_GOVERNOR_PER_POLICY,
 	.verify			= cpufreq_generic_frequency_table_verify,
-	.target			= bL_cpufreq_set_target,
+	.target_index		= bL_cpufreq_set_target,
 	.get			= bL_cpufreq_get,
 	.init			= bL_cpufreq_init,
 	.exit			= bL_cpufreq_exit,